Both the same. They're both black = pain in the ass to keep clean, but looks stunning when washed and waxed. Sapphire Black is a metallic color, so it looks a bit nicer. Jet black is non-metallic, and looks much deeper when clean/waxed. Can't go wrong with either!
Imola Red / Imola Red ///M5
E60 SSK, Dice iPod, Illuminated ZHP knob, MKIV, Euro Armrest, GT ExhaustDaily:
BCR Coilovers, 19x10 + 19x11 Rial Daytona Race, Michelin Pilot Super Sport
'04 E55 AMG Brilliant Silver on Anthracite leather
'96 318i Alpine White on Black
'01 330Ci Titanium Silver on Coral Red
'96 328i Jet Black on Black